Smoking Marijuana vs Using a Cannabis Vaporizer

Cannabis vapor has less tar, but may contain more ammonia. What happens to respiratory symptoms when regular users of joints, blunts, pipes, and bongs switch to a vaporizer?

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In case you missed the previous video, check out Effects of Smoking Marijuana on the Lungs (http://nutritionfacts.org/video/effects-of-smoking-marijuana-on-the-lungs).

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